arm64: head.S: fix up stale comments

mrutland-arm · wildea01 · commit 510224c2b10a · 2017-01-10T12:36:22.000Z
In commit 23c8a50 ("arm64: kernel: use ordinary return/argument register for el2_setup()"), we stopped using w20 as a global stash of the boot mode flag, and instead pass this around in w0 as a function parameter. Unfortunately, we missed a couple of comments, which still refer to the old convention of using w20/x20. This patch fixes up the comments to describe the code as it currently works. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
@@ -483,7 +483,7 @@ ENTRY(kimage_vaddr)
  * If we're fortunate enough to boot at EL2, ensure that the world is
  * sane before dropping to EL1.
  *
- * Returns either BOOT_CPU_MODE_EL1 or BOOT_CPU_MODE_EL2 in x20 if
+ * Returns either BOOT_CPU_MODE_EL1 or BOOT_CPU_MODE_EL2 in w0 if
  * booted in EL1 or EL2 respectively.
  */
 ENTRY(el2_setup)
@@ -628,7 +628,7 @@ ENDPROC(el2_setup)
 
 /*
  * Sets the __boot_cpu_mode flag depending on the CPU boot mode passed
- * in x20. See arch/arm64/include/asm/virt.h for more info.
+ * in w0. See arch/arm64/include/asm/virt.h for more info.
  */
 set_cpu_boot_mode_flag:
 	adr_l	x1, __boot_cpu_mode
