[PATCH v3 0/4] MIPS: Modify mem= and memmap= parameter

[PATCH v3 0/4] MIPS: Modify mem= and memmap= parameter

[Tiezhu Yang]

In the current code, the kernel command-line parameter mem= and memmap=
can not work well on MIPS, this patchset refactors the related code to
fix them.

For kdump on MIPS, if the users want to limit the memory region for the
capture kernel to avoid corrupting the memory image of the panic kernel,
use the parameter memmap=limit@base is the proper way, I will submit a
patch to use memmap=limit@base for kexec-tools after this patchset is
applied.

v3: Modify patch #3 to maintain compatibility for memmap=limit{$,#,!}base,
    commented by Mike Rapoport, thank you.

v2: Add some new patches to support memmap=limit@base

Tiezhu Yang (4):
  MIPS: Refactor early_parse_mem() to fix mem= parameter
  memblock: Introduce memblock_mem_range_remove_map()
  MIPS: Refactor early_parse_memmap() to fix memmap= parameter
  MIPS: Remove not used variable usermem

 arch/mips/kernel/setup.c | 69 ++++++++++++++++++++++--------------------------
 include/linux/memblock.h |  1 +
 mm/memblock.c            |  9 +++++--
 3 files changed, 40 insertions(+), 39 deletions(-)

-- 
2.1.0

[PATCH v3 1/4] MIPS: Refactor early_parse_mem() to fix mem= parameter

[Tiezhu Yang]

According to Documentation/admin-guide/kernel-parameters.txt,
the kernel command-line parameter mem= means "Force usage of
a specific amount of memory", but when add "mem=3G" to the
command-line, kernel boot hangs in sparse_init().

This commit is similar with the implementation of the other
archs such as arm64, powerpc and riscv, refactor the function
early_parse_mem() and then use memblock_enforce_memory_limit()
to limit the memory size.

With this patch, when add "mem=3G" to the command-line, the
kernel boots successfully, we can see the following messages:

  [    0.000000] Memory limited to 3072MB
  ...
  [    0.000000] Early memory node ranges
  [    0.000000]   node   0: [mem 0x0000000000200000-0x000000000effffff]
  [    0.000000]   node   0: [mem 0x0000000090200000-0x00000000ffffffff]
  [    0.000000]   node   0: [mem 0x0000000120000000-0x00000001613fffff]
  ...
  [    0.000000] Memory: 3005280K/3145728K available (...)

After login, the output of free command is consistent with the
above log.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/mips/kernel/setup.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f979adf..6b6d718 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -339,27 +339,15 @@ static void __init bootmem_init(void)
 #endif	/* CONFIG_SGI_IP27 */
 
 static int usermem __initdata;
+static phys_addr_t memory_limit;
 
 static int __init early_parse_mem(char *p)
 {
-	phys_addr_t start, size;
-
-	/*
-	 * If a user specifies memory size, we
-	 * blow away any automatically generated
-	 * size.
-	 */
-	if (usermem == 0) {
-		usermem = 1;
-		memblock_remove(memblock_start_of_DRAM(),
-			memblock_end_of_DRAM() - memblock_start_of_DRAM());
-	}
-	start = 0;
-	size = memparse(p, &p);
-	if (*p == '@')
-		start = memparse(p + 1, &p);
+	if (!p)
+		return 1;
 
-	memblock_add(start, size);
+	memory_limit = memparse(p, &p) & PAGE_MASK;
+	pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
 
 	return 0;
 }
@@ -678,6 +666,10 @@ static void __init arch_mem_init(char **cmdline_p)
 	memblock_reserve(__pa_symbol(&__nosave_begin),
 		__pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 
+	/* Limit the memory. */
+	memblock_enforce_memory_limit(memory_limit);
+	memblock_allow_resize();
+
 	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 }
 
-- 
2.1.0

[PATCH v3 2/4] memblock: Introduce memblock_mem_range_remove_map()

[Tiezhu Yang]

This is preparation for supporting memmap=limit@base parameter,
no functionality change.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 include/linux/memblock.h | 1 +
 mm/memblock.c            | 9 +++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 50ad196..e558d2c 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -482,6 +482,7 @@ phys_addr_t memblock_end_of_DRAM(void);
 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 void memblock_mem_limit_remove_map(phys_addr_t limit);
+void memblock_mem_range_remove_map(phys_addr_t base, phys_addr_t limit);
 bool memblock_is_memory(phys_addr_t addr);
 bool memblock_is_map_memory(phys_addr_t addr);
 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
diff --git a/mm/memblock.c b/mm/memblock.c
index 1018e50..2476d15d 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1723,7 +1723,7 @@ void __init memblock_cap_memory_range(phys_addr_t base, phys_addr_t size)
 			base + size, PHYS_ADDR_MAX);
 }
 
-void __init memblock_mem_limit_remove_map(phys_addr_t limit)
+void __init memblock_mem_range_remove_map(phys_addr_t base, phys_addr_t limit)
 {
 	phys_addr_t max_addr;
 
@@ -1736,7 +1736,12 @@ void __init memblock_mem_limit_remove_map(phys_addr_t limit)
 	if (max_addr == PHYS_ADDR_MAX)
 		return;
 
-	memblock_cap_memory_range(0, max_addr);
+	memblock_cap_memory_range(base, max_addr);
+}
+
+void __init memblock_mem_limit_remove_map(phys_addr_t limit)
+{
+	memblock_mem_range_remove_map(0, limit);
 }
 
 static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
-- 
2.1.0

[PATCH v3 3/4] MIPS: Refactor early_parse_memmap() to fix memmap= parameter

[Tiezhu Yang]

According to Documentation/admin-guide/kernel-parameters.txt,
the kernel command-line parameter memmap= means "Force usage
of a specific region of memory", but when add "memmap=3G@64M"
to the command-line, kernel boot hangs in sparse_init().

In order to support memmap=limit@base, refactor the function
early_parse_memmap() and then use memblock_mem_range_remove_map()
to limit the memory region.

With this patch, when add "memmap=3G@64M" to the command-line,
the kernel boots successfully, we can see the following messages:

  [    0.000000] Memory limited to 64MB-3136MB
  ...
  [    0.000000] Early memory node ranges
  [    0.000000]   node   0: [mem 0x0000000004000000-0x000000000effffff]
  [    0.000000]   node   0: [mem 0x0000000090200000-0x00000000ffffffff]
  [    0.000000]   node   0: [mem 0x0000000120000000-0x00000001653fffff]
  ...
  [    0.000000] Memory: 3070816K/3147776K available (...)

When add "memmap=128M@64M nr_cpus=1 init 3" to the command-line,
the kernel also boots successfully, we can see the following messages:

  [    0.000000] Memory limited to 64MB-192MB
  ...
  [    0.000000] Early memory node ranges
  [    0.000000]   node   0: [mem 0x0000000004000000-0x000000000c1fffff]
  ...
  [    0.000000] Memory: 95312K/133120K available (...)

After login, the output of free command is consistent with the
above log.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/mips/kernel/setup.c | 40 ++++++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 16 deletions(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 6b6d718..c940405 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -340,6 +340,7 @@ static void __init bootmem_init(void)
 
 static int usermem __initdata;
 static phys_addr_t memory_limit;
+static phys_addr_t memory_base;
 
 static int __init early_parse_mem(char *p)
 {
@@ -356,7 +357,6 @@ early_param("mem", early_parse_mem);
 static int __init early_parse_memmap(char *p)
 {
 	char *oldp;
-	u64 start_at, mem_size;
 
 	if (!p)
 		return -EINVAL;
@@ -367,30 +367,38 @@ static int __init early_parse_memmap(char *p)
 	}
 
 	oldp = p;
-	mem_size = memparse(p, &p);
+	memory_limit = memparse(p, &p) & PAGE_MASK;
 	if (p == oldp)
 		return -EINVAL;
 
 	if (*p == '@') {
-		start_at = memparse(p+1, &p);
-		memblock_add(start_at, mem_size);
+		memory_base = memparse(p + 1, &p) & PAGE_MASK;
+	} else if (*p == '$') {
+		memory_base = memparse(p+1, &p) & PAGE_MASK;
+		memblock_reserve(memory_base, memory_limit);
+		pr_notice("Memory reserved to %lldMB-%lldMB\n",
+			  memory_base >> 20, (memory_base + memory_limit) >> 20);
+		memory_base = 0;
+		memory_limit = 0;
+		return 0;
 	} else if (*p == '#') {
-		pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
+		pr_err("\"memmap=nn#ss\" invalid on MIPS\n");
+		memory_limit = 0;
+		return -EINVAL;
+	} else if (*p == '!') {
+		pr_err("\"memmap=nn!ss\" invalid on MIPS\n");
+		memory_limit = 0;
 		return -EINVAL;
-	} else if (*p == '$') {
-		start_at = memparse(p+1, &p);
-		memblock_add(start_at, mem_size);
-		memblock_reserve(start_at, mem_size);
 	} else {
-		pr_err("\"memmap\" invalid format!\n");
+		pr_err("Unrecognized memmap syntax: %s\n", p);
+		memory_limit = 0;
 		return -EINVAL;
 	}
 
-	if (*p == '\0') {
-		usermem = 1;
-		return 0;
-	} else
-		return -EINVAL;
+	pr_notice("Memory limited to %lldMB-%lldMB\n",
+		  memory_base >> 20, (memory_base + memory_limit) >> 20);
+
+	return *p == '\0' ? 0 : -EINVAL;
 }
 early_param("memmap", early_parse_memmap);
 
@@ -667,7 +675,7 @@ static void __init arch_mem_init(char **cmdline_p)
 		__pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 
 	/* Limit the memory. */
-	memblock_enforce_memory_limit(memory_limit);
+	memblock_mem_range_remove_map(memory_base, memory_limit);
 	memblock_allow_resize();
 
 	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
-- 
2.1.0

[PATCH v3 4/4] MIPS: Remove not used variable usermem

[Tiezhu Yang]

Now, the variable usermem is not used any more, just remove it.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/mips/kernel/setup.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index c940405..89fdaae 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -338,7 +338,6 @@ static void __init bootmem_init(void)
 
 #endif	/* CONFIG_SGI_IP27 */
 
-static int usermem __initdata;
 static phys_addr_t memory_limit;
 static phys_addr_t memory_base;
 
@@ -628,10 +627,6 @@ static void __init arch_mem_init(char **cmdline_p)
 	*cmdline_p = command_line;
 
 	parse_early_param();
-
-	if (usermem)
-		pr_info("User-defined physical RAM map overwrite\n");
-
 	check_kernel_sections_mem();
 
 	early_init_fdt_reserve_self();
-- 
2.1.0

Re: [PATCH v3 1/4] MIPS: Refactor early_parse_mem() to fix mem= parameter

[kernel test robot]

Hi Tiezhu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hnaz-mm/master]
[also build test WARNING on linus/master v5.17-rc6 next-20220225]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Tiezhu-Yang/MIPS-Modify-mem-and-memmap-parameter/20220228-212554
base:   https://github.com/hnaz/linux-mm master
config: mips-randconfig-r025-20220228 (https://download.01.org/0day-ci/archive/20220228/202202282330.uO0sH1Bk-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/8e3bd7f4c0a4003c328ef2d816454dd50810b974
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tiezhu-Yang/MIPS-Modify-mem-and-memmap-parameter/20220228-212554
        git checkout 8e3bd7f4c0a4003c328ef2d816454dd50810b974
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/mips/kernel/setup.c:350:42: warning: format specifies type 'long long' but the argument has type 'phys_addr_t' (aka 'unsigned int') [-Wformat]
           pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
                                        ~~~~       ^~~~~~~~~~~~~~~~~~
                                        %u
   include/linux/printk.h:509:36: note: expanded from macro 'pr_notice'
           printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
                                     ~~~     ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   1 warning generated.


vim +350 arch/mips/kernel/setup.c

   343	
   344	static int __init early_parse_mem(char *p)
   345	{
   346		if (!p)
   347			return 1;
   348	
   349		memory_limit = memparse(p, &p) & PAGE_MASK;
 > 350		pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
   351	
   352		return 0;
   353	}
   354	early_param("mem", early_parse_mem);
   355	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Re: [PATCH v3 3/4] MIPS: Refactor early_parse_memmap() to fix memmap= parameter

[kernel test robot]

Hi Tiezhu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hnaz-mm/master]
[also build test WARNING on linus/master v5.17-rc6 next-20220225]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Tiezhu-Yang/MIPS-Modify-mem-and-memmap-parameter/20220228-212554
base:   https://github.com/hnaz/linux-mm master
config: mips-randconfig-r025-20220228 (https://download.01.org/0day-ci/archive/20220301/202203010025.PU3GDSWx-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/ab143b3c599254c414419565480fc01acb23452a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tiezhu-Yang/MIPS-Modify-mem-and-memmap-parameter/20220228-212554
        git checkout ab143b3c599254c414419565480fc01acb23452a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   arch/mips/kernel/setup.c:351:42: warning: format specifies type 'long long' but the argument has type 'phys_addr_t' (aka 'unsigned int') [-Wformat]
           pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
                                        ~~~~       ^~~~~~~~~~~~~~~~~~
                                        %u
   include/linux/printk.h:509:36: note: expanded from macro 'pr_notice'
           printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
                                     ~~~     ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   arch/mips/kernel/setup.c:380:6: warning: format specifies type 'long long' but the argument has type 'phys_addr_t' (aka 'unsigned int') [-Wformat]
                             memory_base >> 20, (memory_base + memory_limit) >> 20);
                             ^~~~~~~~~~~~~~~~~
   include/linux/printk.h:509:36: note: expanded from macro 'pr_notice'
           printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
                                     ~~~     ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
>> arch/mips/kernel/setup.c:380:25: warning: format specifies type 'long long' but the argument has type 'unsigned int' [-Wformat]
                             memory_base >> 20, (memory_base + memory_limit) >> 20);
                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/printk.h:509:36: note: expanded from macro 'pr_notice'
           printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
                                     ~~~     ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   arch/mips/kernel/setup.c:399:5: warning: format specifies type 'long long' but the argument has type 'phys_addr_t' (aka 'unsigned int') [-Wformat]
                     memory_base >> 20, (memory_base + memory_limit) >> 20);
                     ^~~~~~~~~~~~~~~~~
   include/linux/printk.h:509:36: note: expanded from macro 'pr_notice'
           printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
                                     ~~~     ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   arch/mips/kernel/setup.c:399:24: warning: format specifies type 'long long' but the argument has type 'unsigned int' [-Wformat]
                     memory_base >> 20, (memory_base + memory_limit) >> 20);
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/printk.h:509:36: note: expanded from macro 'pr_notice'
           printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
                                     ~~~     ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   5 warnings generated.


vim +380 arch/mips/kernel/setup.c

   356	
   357	static int __init early_parse_memmap(char *p)
   358	{
   359		char *oldp;
   360	
   361		if (!p)
   362			return -EINVAL;
   363	
   364		if (!strncmp(p, "exactmap", 8)) {
   365			pr_err("\"memmap=exactmap\" invalid on MIPS\n");
   366			return 0;
   367		}
   368	
   369		oldp = p;
   370		memory_limit = memparse(p, &p) & PAGE_MASK;
   371		if (p == oldp)
   372			return -EINVAL;
   373	
   374		if (*p == '@') {
   375			memory_base = memparse(p + 1, &p) & PAGE_MASK;
   376		} else if (*p == '$') {
   377			memory_base = memparse(p+1, &p) & PAGE_MASK;
   378			memblock_reserve(memory_base, memory_limit);
   379			pr_notice("Memory reserved to %lldMB-%lldMB\n",
 > 380				  memory_base >> 20, (memory_base + memory_limit) >> 20);
   381			memory_base = 0;
   382			memory_limit = 0;
   383			return 0;
   384		} else if (*p == '#') {
   385			pr_err("\"memmap=nn#ss\" invalid on MIPS\n");
   386			memory_limit = 0;
   387			return -EINVAL;
   388		} else if (*p == '!') {
   389			pr_err("\"memmap=nn!ss\" invalid on MIPS\n");
   390			memory_limit = 0;
   391			return -EINVAL;
   392		} else {
   393			pr_err("Unrecognized memmap syntax: %s\n", p);
   394			memory_limit = 0;
   395			return -EINVAL;
   396		}
   397	
   398		pr_notice("Memory limited to %lldMB-%lldMB\n",
   399			  memory_base >> 20, (memory_base + memory_limit) >> 20);
   400	
   401		return *p == '\0' ? 0 : -EINVAL;
   402	}
   403	early_param("memmap", early_parse_memmap);
   404	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org