diff options
| author | Andy Lutomirski <luto@kernel.org> | 2025-04-02 11:45:39 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-12 10:06:04 +0200 |
| commit | e7021e2fe0b4335523d3f6e2221000bdfc633b62 (patch) | |
| tree | 6b135a1208f59e333dd6d3e3c413de6dbebde248 | |
| parent | 58f8ffa917669a0c8c027e24d5349f0b488f8181 (diff) | |
x86/efi: Make efi_enter/leave_mm() use the use_/unuse_temporary_mm() machinery
This should be considerably more robust. It's also necessary for optimized
for_each_possible_lazymm_cpu() on x86 -- without this patch, EFI calls in
lazy context would remove the lazy mm from mm_cpumask().
[ mingo: Merged it on top of x86/alternatives ]
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20250402094540.3586683-7-mingo@kernel.org
| -rw-r--r-- | arch/x86/platform/efi/efi_64.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index ac57259a432b..a5d3496d32a5 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -434,15 +434,12 @@ void __init efi_dump_pagetable(void) */ static void efi_enter_mm(void) { - efi_prev_mm = current->active_mm; - current->active_mm = &efi_mm; - switch_mm(efi_prev_mm, &efi_mm, NULL); + efi_prev_mm = use_temporary_mm(&efi_mm); } static void efi_leave_mm(void) { - current->active_mm = efi_prev_mm; - switch_mm(&efi_mm, efi_prev_mm, NULL); + unuse_temporary_mm(efi_prev_mm); } void arch_efi_call_virt_setup(void) |