[PATCH 04/12] ARM: head-common.S: use PC-relative insn sequence for __proc_info
From: Ard Biesheuvel <ardb@kernel.org>
Date: 2020-09-14 09:59:09
Also in:
linux-efi
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Replace the open coded PC relative offset calculations with a pair of adr_l invocations. This removes some open coded arithmetic involving virtual addresses, avoids literal pools on v7+, and slightly reduces the footprint of the code. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/arm/kernel/head-common.S | 22 ++++++-------------- 1 file changed, 6 insertions(+), 16 deletions(-)
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 4a3982812a40..9a5ab6c19568 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S@@ -170,11 +170,12 @@ ENDPROC(lookup_processor_type) * r9 = cpuid (preserved) */ __lookup_processor_type: - adr r3, __lookup_processor_type_data - ldmia r3, {r4 - r6} - sub r3, r3, r4 @ get offset between virt&phys - add r5, r5, r3 @ convert virt addresses to - add r6, r6, r3 @ physical address space + /* + * Look in <asm/procinfo.h> for information about the __proc_info + * structure. + */ + adr_l r5, __proc_info_begin + adr_l r6, __proc_info_end 1: ldmia r5, {r3, r4} @ value, mask and r4, r4, r9 @ mask wanted bits teq r3, r4
@@ -186,17 +187,6 @@ __lookup_processor_type: 2: ret lr ENDPROC(__lookup_processor_type) -/* - * Look in <asm/procinfo.h> for information about the __proc_info structure. - */ - .align 2 - .type __lookup_processor_type_data, %object -__lookup_processor_type_data: - .long . - .long __proc_info_begin - .long __proc_info_end - .size __lookup_processor_type_data, . - __lookup_processor_type_data - __error_lpae: #ifdef CONFIG_DEBUG_LL adr r0, str_lpae
--
2.17.1
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