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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=dBYFArVv8DgQwTOhXcFrq5eacok3vrOckMgsfIeMP9E8+Tx8IlH/rbYfzpCQF7qxn PrRVggjNP3h4nPwyft1ja8QH3WU2XnQJAXZWL+PfFMYFvgb7y6FMa2zRPKmMBCidc7 YW34P13UUVFhVmphad8ixLXOBqfVXQfHTsdBxjKA= Message-ID: Date: Fri, 10 Apr 2026 09:32:22 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC V1 11/16] arm64/mm: Route all pgtable atomics to central helpers To: "David Hildenbrand (Arm)" , linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Ryan Roberts , Mark Rutland , Lorenzo Stoakes , Andrew Morton , Mike Rapoport , Linu Cherian , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260224051153.3150613-1-anshuman.khandual@arm.com> <20260224051153.3150613-12-anshuman.khandual@arm.com> Content-Language: en-US From: Anshuman Khandual In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 18447C0002 X-Stat-Signature: 8fct36rmsetzjo4z6wrgduppqfd5jgmz X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1775793750-682562 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 08/04/26 5:58 PM, David Hildenbrand (Arm) wrote: > On 2/24/26 06:11, Anshuman Khandual wrote: >> Route all cmpxchg() operations performed on various page table entries to a >> new ptdesc_cmpxchg_relaxed() helper. Similarly route all xchg() operations >> performed on page table entries to a new ptdesc_xchg_relaxed() helper. >> >> Currently these helpers just forward to the same APIs that were previously >> called direct, but in future we will change the routing for D128 which is >> too long to use the standard APIs. >> >> Cc: Catalin Marinas >> Cc: Will Deacon >> Cc: Ryan Roberts >> Cc: Mark Rutland >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Anshuman Khandual >> --- >> arch/arm64/include/asm/pgtable.h | 23 +++++++++++++++++------ >> arch/arm64/mm/fault.c | 2 +- >> 2 files changed, 18 insertions(+), 7 deletions(-) >> >> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h >> index 42124d2f323d..cf69ce68f951 100644 >> --- a/arch/arm64/include/asm/pgtable.h >> +++ b/arch/arm64/include/asm/pgtable.h >> @@ -87,6 +87,17 @@ static inline void arch_leave_lazy_mmu_mode(void) >> #define ptdesc_get(x) READ_ONCE(x) >> #define ptdesc_set(x, val) WRITE_ONCE(x, val) >> >> +static inline ptdesc_t ptdesc_cmpxchg_relaxed(ptdesc_t *ptep, ptdesc_t old, >> + ptdesc_t new) >> +{ >> + return cmpxchg_relaxed(ptep, old, new); >> +} >> + >> +static inline ptdesc_t ptdesc_xchg_relaxed(ptdesc_t *ptep, ptdesc_t new) >> +{ >> + return xchg_relaxed(ptep, new); >> +} >> + > > We really want the rename of ptdesc_t before this change. > Planning to rename ptdesc_t as ptent_t in a pre-requisite patch early in the series.