Thread (64 messages) 64 messages, 10 authors, 2023-02-04

Re: [PATCH v2 02/16] powerpc: override __ALIGN() and __ALIGN_STR() macros

From: Peter Zijlstra <peterz@infradead.org>
Date: 2022-09-05 11:04:15
Also in: lkml

On Mon, Aug 29, 2022 at 11:22:09AM +0530, Sathvika Vasireddy wrote:
quoted hunk ↗ jump to hunk
Powerpc instructions must be word-aligned. Currently,
there is an alignment of 16 bytes (by default), and it is
much more than what is required for powerpc (4 bytes).

The default expansion of __ALIGN() macro is:
#define __ALIGN       .align 4,0x90

Since Powerpc Linux does not require a 16 byte alignment,
override __ALIGN() and __ALIGN_STR() macros to use required
4 byte alignment.

Signed-off-by: Sathvika Vasireddy <redacted>
---
 arch/powerpc/include/asm/linkage.h | 4 ++++
 1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/include/asm/linkage.h b/arch/powerpc/include/asm/linkage.h
index b71b9582e754..8df88fe61438 100644
--- a/arch/powerpc/include/asm/linkage.h
+++ b/arch/powerpc/include/asm/linkage.h
@@ -2,8 +2,12 @@
 #ifndef _ASM_POWERPC_LINKAGE_H
 #define _ASM_POWERPC_LINKAGE_H
 
+#include <linux/stringify.h>
 #include <asm/types.h>
 
+#define __ALIGN			.align 2
+#define __ALIGN_STR		__stringify(__ALIGN)

Related thread:

  https://lkml.kernel.org/r/YxXJswK9QjhCGmPN@hirez.programming.kicks-ass.net
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