From 7cf2d6efb86fc98c4f5f78e438e2e32d88d76ff7 Mon Sep 17 00:00:00 2001 From: Ada Couprie Diaz Date: Mon, 27 Jul 2026 17:34:10 +0100 Subject: [PATCH] arm64: debug: don't mask DAIF for mdscr_write() 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 Signed-off-by: Vladimir Murzin Signed-off-by: Will Deacon --- arch/arm64/kernel/debug-monitors.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index 29307642f4c9..e271fbac5f82 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -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);