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arm64: debug: don't mask DAIF for mdscr_write()

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Masking DAIF around the write to MDSCR_EL1 doesn't do anything: we can
write to sysregs with interrupts unmasked, and writing to PSTATE is
not a context synchronization event so it does not synchronize it.

This is done in the context of a general interrupt handling cleanup,
so it does not address the missing context synchronization for the
MDSCR_EL1 write, staying consistent with the current state.  This
should be addressed in a future patch.

Signed-off-by: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ada Couprie Diaz
2026-07-27 17:34:10 +01:00
committed by Will Deacon
parent b7f741717d
commit 7cf2d6efb8
1 changed files with 0 additions and 3 deletions
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3
arch/arm64/kernel/debug-monitors.c
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@@ -40,10 +40,7 @@ u8 debug_monitors_arch(void)
*/
static void mdscr_write(u64 mdscr)
{
unsigned long flags;
flags = local_daif_save();
write_sysreg(mdscr, mdscr_el1);
local_daif_restore(flags);
}
NOKPROBE_SYMBOL(mdscr_write);