github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 17:13:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

x86/efi: Make efi_enter/leave_mm() use the use_/unuse_temporary_mm() machinery

Browse Source 
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
This commit is contained in:
Andy Lutomirski 2025-04-02 11:45:39 +02:00 committed by Ingo Molnar
parent 58f8ffa917
commit e7021e2fe0
1 changed files with 2 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/platform/efi/efi_64.c
View File

@ -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)