From: Hugh Dickins <hughd@google.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: mm: ptl is not bloated if it fits in pointer
Date: Mon, 16 Dec 2013 01:04:13 -0800 (PST) [thread overview]
Message-ID: <alpine.LNX.2.00.1312160053530.3066@eggly.anvils> (raw)
It's silly to force the 64-bit CONFIG_GENERIC_LOCKBREAK architectures
to kmalloc eight bytes for an indirect page table lock: the lock needs
to fit in the space that a pointer to it would occupy, not into an int.
Signed-off-by: Hugh Dickins <hughd@google.com>
---
kernel/bounds.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 3.13-rc4/kernel/bounds.c 2013-11-22 15:40:37.452192638 -0800
+++ linux/kernel/bounds.c 2013-12-15 14:34:36.304485959 -0800
@@ -22,6 +22,6 @@ void foo(void)
#ifdef CONFIG_SMP
DEFINE(NR_CPUS_BITS, ilog2(CONFIG_NR_CPUS));
#endif
- DEFINE(BLOATED_SPINLOCKS, sizeof(spinlock_t) > sizeof(int));
+ DEFINE(BLOATED_SPINLOCKS, sizeof(spinlock_t) > sizeof(spinlock_t *));
/* End of constants */
}
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2013-12-16 9:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 9:04 Hugh Dickins [this message]
2013-12-16 10:04 ` Peter Zijlstra
2013-12-16 13:50 ` Kirill A. Shutemov
2013-12-17 0:29 ` Hugh Dickins
2013-12-16 10:12 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.LNX.2.00.1312160053530.3066@eggly.anvils \
--to=hughd@google.com \
--cc=akpm@linux-foundation.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=peterz@infradead.org \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox