diff options
| author |   Will Deacon <will@kernel.org> | 2020-02-28 12:43:55 +0000 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2020-02-28 13:39:03 +0000 |
| commit | 90765f745b08fdf069e4562f6985bdba0fefad8d (patch) | |
| tree | 66784dd2e4562796da4c4489389626e11bdac7ab /arch/arm64/include/asm/mmu.h | |
| parent | arm64: mm: convert cpu_do_switch_mm() to C (diff) | |
| download | linux-dev-90765f745b08fdf069e4562f6985bdba0fefad8d.tar.xz linux-dev-90765f745b08fdf069e4562f6985bdba0fefad8d.zip | |
arm64: Update comment for ASID() macro
Commit 25b92693a1b6 ("arm64: mm: convert cpu_do_switch_mm() to C") added
a new use of the ASID() macro, so update the comment in asm/mmu.h which
reasons about why an atomic reload of 'mm->context.id.counter' is not
required.
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/mmu.h')
| -rw-r--r-- | arch/arm64/include/asm/mmu.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index e4d862420bb4..21a4bcfdb378 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -23,9 +23,9 @@ typedef struct { } mm_context_t; /* - * This macro is only used by the TLBI code, which cannot race with an - * ASID change and therefore doesn't need to reload the counter using - * atomic64_read. + * This macro is only used by the TLBI and low-level switch_mm() code, + * neither of which can race with an ASID change. We therefore don't + * need to reload the counter using atomic64_read(). */ #define ASID(mm) ((mm)->context.id.counter & 0xffff) |