x86/crc: add ANNOTATE_NOENDBR to suppress objtool warnings

The assembly functions generated by crc-pclmul-template.S are called
only via static_call, so they do not need to begin with an endbr
instruction.  But objtool still warns about a missing endbr by default.
Add ANNOTATE_NOENDBR to suppress these warnings:

    vmlinux.o: warning: objtool: crc32_x86_init+0x1c0: relocation to !ENDBR: crc32_lsb_vpclmul_avx10_256+0x0
    vmlinux.o: warning: objtool: crc64_x86_init+0x183: relocation to !ENDBR: crc64_msb_vpclmul_avx10_256+0x0
    vmlinux.o: warning: objtool: crc_t10dif_x86_init+0x183: relocation to !ENDBR: crc16_msb_vpclmul_avx10_256+0x0
    vmlinux.o: warning: objtool: __SCK__crc32_lsb_pclmul+0x0: data relocation to !ENDBR: crc32_lsb_pclmul_sse+0x0
    vmlinux.o: warning: objtool: __SCK__crc64_lsb_pclmul+0x0: data relocation to !ENDBR: crc64_lsb_pclmul_sse+0x0
    vmlinux.o: warning: objtool: __SCK__crc64_msb_pclmul+0x0: data relocation to !ENDBR: crc64_msb_pclmul_sse+0x0
    vmlinux.o: warning: objtool: __SCK__crc16_msb_pclmul+0x0: data relocation to !ENDBR: crc16_msb_pclmul_sse+0x0

Fixes: 8d2d3e72e35b ("x86/crc: add "template" for [V]PCLMULQDQ based CRC functions")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/r/20250217170555.3d14df62@canb.auug.org.au/
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250217193230.100443-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

diff --git a/arch/x86/lib/crc-pclmul-template.S b/arch/x86/lib/crc-pclmul-template.S
index dc91cc074b300220d23c373702627299cf4409ae..a19b730b642d36d5d0394751e218714410c12bec 100644 (file)
--- a/arch/x86/lib/crc-pclmul-template.S
+++ b/arch/x86/lib/crc-pclmul-template.S
@@ -7,6 +7,7 @@
 // Author: Eric Biggers <ebiggers@google.com>
 
 #include <linux/linkage.h>
+#include <linux/objtool.h>
 
 // Offsets within the generated constants table
 .set OFFSETOF_BSWAP_MASK,                      -5*16   // msb-first CRCs only
@@ -272,6 +273,10 @@
        .set    CONSTS_YMM,     %ymm7
        .set    CONSTS_XMM,     %xmm7
 
+       // Use ANNOTATE_NOENDBR to suppress an objtool warning, since the
+       // functions generated by this macro are called only by static_call.
+       ANNOTATE_NOENDBR
+
 #ifdef __i386__
        push            CONSTS_PTR
        mov             8(%esp), CONSTS_PTR