arm64: pt_regs: rename "pmr_save" -> "pmr"

The pt_regs::pmr_save field is weirdly named relative to all other
pt_regs fields, with a '_save' suffix that doesn't make anything clearer
and only leads to more typing to access the field.

Remove the '_save' suffix.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Puranjay Mohan <puranjay12@gmail.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20241017092538.1859841-4-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Author: mrutland-arm

arch/arm64/include/asm/daifflags.h

@@ -132,7 +132,7 @@ static inline void local_daif_inherit(struct pt_regs *regs)
 		trace_hardirqs_on();
 
 	if (system_uses_irq_prio_masking())
-		gic_write_pmr(regs->pmr_save);
+		gic_write_pmr(regs->pmr);
 
 	/*
 	 * We can't use local_daif_restore(regs->pstate) here as

arch/arm64/include/asm/processor.h

@@ -293,7 +293,7 @@ static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
 	regs->pc = pc;
 
 	if (system_uses_irq_prio_masking())
-		regs->pmr_save = GIC_PRIO_IRQON;
+		regs->pmr = GIC_PRIO_IRQON;
 }
 
 static inline void start_thread(struct pt_regs *regs, unsigned long pc,

arch/arm64/include/asm/ptrace.h

@@ -167,7 +167,7 @@ struct pt_regs {
 
 	u64 sdei_ttbr1;
 	/* Only valid when ARM64_HAS_GIC_PRIO_MASKING is enabled. */
-	u64 pmr_save;
+	u64 pmr;
 	u64 stackframe[2];
 
 	/* Only valid for some EL1 exceptions. */
@@ -211,7 +211,7 @@ static inline void forget_syscall(struct pt_regs *regs)
 
 #define irqs_priority_unmasked(regs)					\
 	(system_uses_irq_prio_masking() ?				\
-		(regs)->pmr_save == GIC_PRIO_IRQON :			\
+		(regs)->pmr == GIC_PRIO_IRQON :				\
 		true)
 
 #define interrupts_enabled(regs)			\

arch/arm64/kernel/asm-offsets.c

@@ -79,7 +79,7 @@ int main(void)
   DEFINE(S_PSTATE,		offsetof(struct pt_regs, pstate));
   DEFINE(S_SYSCALLNO,		offsetof(struct pt_regs, syscallno));
   DEFINE(S_SDEI_TTBR1,		offsetof(struct pt_regs, sdei_ttbr1));
-  DEFINE(S_PMR_SAVE,		offsetof(struct pt_regs, pmr_save));
+  DEFINE(S_PMR,			offsetof(struct pt_regs, pmr));
   DEFINE(S_STACKFRAME,		offsetof(struct pt_regs, stackframe));
   DEFINE(PT_REGS_SIZE,		sizeof(struct pt_regs));
   BLANK();

arch/arm64/kernel/entry.S

@@ -315,7 +315,7 @@ alternative_if_not ARM64_HAS_GIC_PRIO_MASKING
 alternative_else_nop_endif
 
 	mrs_s	x20, SYS_ICC_PMR_EL1
-	str	x20, [sp, #S_PMR_SAVE]
+	str	x20, [sp, #S_PMR]
 	mov	x20, #GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET
 	msr_s	SYS_ICC_PMR_EL1, x20
 
@@ -342,7 +342,7 @@ alternative_if_not ARM64_HAS_GIC_PRIO_MASKING
 	b	.Lskip_pmr_restore\@
 alternative_else_nop_endif
 
-	ldr	x20, [sp, #S_PMR_SAVE]
+	ldr	x20, [sp, #S_PMR]
 	msr_s	SYS_ICC_PMR_EL1, x20
 
 	/* Ensure priority change is seen by redistributor */

arch/arm64/kernel/process.c

@@ -227,7 +227,7 @@ void __show_regs(struct pt_regs *regs)
 	printk("sp : %016llx\n", sp);
 
 	if (system_uses_irq_prio_masking())
-		printk("pmr_save: %08llx\n", regs->pmr_save);
+		printk("pmr: %08llx\n", regs->pmr);
 
 	i = top_reg;