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xor: use static_call for xor_gen 

Avoid the indirect call for xor_generation by using a static_call.

Link: https://lkml.kernel.org/r/20260327061704.3707577-28-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Tested-by: Eric Biggers <ebiggers@kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: David Sterba <dsterba@suse.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Li Nan <linan122@huawei.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Magnus Lindholm <linmag7@gmail.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Song Liu <song@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
master
Christoph Hellwig 2026-03-27 07:16:59 +01:00 committed by Andrew Morton
parent 80dcf0a783
commit a21921dd02
1 changed files with 11 additions and 11 deletions
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22
lib/raid/xor/xor-core.c
View File

@ -11,10 +11,10 @@
#include <linux/raid/xor.h>
#include <linux/jiffies.h>
#include <linux/preempt.h>
#include <linux/static_call.h>
#include "xor_impl.h"
/* The xor routine to use. */
static struct xor_block_template *active_template;
DEFINE_STATIC_CALL_NULL(xor_gen_impl, *xor_block_8regs.xor_gen);
/**
* xor_gen - generate RAID-style XOR information
@ -37,13 +37,13 @@ void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes)
WARN_ON_ONCE(bytes == 0);
WARN_ON_ONCE(bytes & 511);
active_template->xor_gen(dest, srcs, src_cnt, bytes);
static_call(xor_gen_impl)(dest, srcs, src_cnt, bytes);
}
EXPORT_SYMBOL(xor_gen);
/* Set of all registered templates. */
static struct xor_block_template *__initdata template_list;
static bool __initdata xor_forced = false;
static struct xor_block_template *forced_template;
/**
* xor_register - register a XOR template
@ -69,7 +69,7 @@ void __init xor_register(struct xor_block_template *tmpl)
*/
void __init xor_force(struct xor_block_template *tmpl)
{
active_template = tmpl;
forced_template = tmpl;
}
#define BENCH_SIZE 4096
@ -111,7 +111,7 @@ static int __init calibrate_xor_blocks(void)
void *b1, *b2;
struct xor_block_template *f, *fastest;
if (xor_forced)
if (forced_template)
return 0;
b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
@ -128,7 +128,7 @@ static int __init calibrate_xor_blocks(void)
if (f->speed > fastest->speed)
fastest = f;
}
active_template = fastest;
static_call_update(xor_gen_impl, fastest->xor_gen);
pr_info("xor: using function: %s (%d MB/sec)\n",
fastest->name, fastest->speed);
@ -156,10 +156,10 @@ static int __init xor_init(void)
* If this arch/cpu has a short-circuited selection, don't loop through
* all the possible functions, just use the best one.
*/
if (active_template) {
if (forced_template) {
pr_info("xor: automatically using best checksumming function %-10s\n",
active_template->name);
xor_forced = true;
forced_template->name);
static_call_update(xor_gen_impl, forced_template->xor_gen);
return 0;
}
@ -170,7 +170,7 @@ static int __init xor_init(void)
* Pick the first template as the temporary default until calibration
* happens.
*/
active_template = template_list;
static_call_update(xor_gen_impl, template_list->xor_gen);
return 0;
#endif
}