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powerpc: Remove dead non-preemption code

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Since commit 7dadeaa6e8 ("sched: Further restrict the preemption
modes"), powerpc always has CONFIG_PREEMPTION because only
CONFIG_PREEMPT and CONFIG_PREEMPT_LAZY are possible, even in
dynamic preemption mode (see sched_dynamic_mode).

As a consequence, need_irq_preemption() is always true and can be
removed.

And because commit bee25f97ad ("powerpc: Enable GENERIC_ENTRY
feature") includes linux/irq-entry-common.h which already declares
sk_dynamic_irqentry_exit_cond_resched static key, asm/preempt.h
becauses useless and can be removed.

Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/2bf10a0afffefb6aca44bf2f864cc17471a80e31.1781870889.git.chleroy@kernel.org
This commit is contained in:
Christophe Leroy (CS GROUP)
2026-06-19 14:08:28 +02:00
committed by Madhavan Srinivasan
parent e4de1b9cb3
commit a2c02aa0c6
2 changed files with 1 additions and 17 deletions
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16
arch/powerpc/include/asm/preempt.h
View File

@@ -1,16 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_POWERPC_PREEMPT_H
#define __ASM_POWERPC_PREEMPT_H
#include <asm-generic/preempt.h>
#if defined(CONFIG_PREEMPT_DYNAMIC)
#include <linux/jump_label.h>
DECLARE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
#define need_irq_preemption() \
(static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched))
#else
#define need_irq_preemption() (IS_ENABLED(CONFIG_PREEMPTION))
#endif
#endif /* __ASM_POWERPC_PREEMPT_H */

2
arch/powerpc/lib/vmx-helper.c
View File

@@ -46,7 +46,7 @@ int exit_vmx_usercopy(void)
* set and we are preemptible. The hack here is to schedule a
* decrementer to fire here and reschedule for us if necessary.
*/
if (need_irq_preemption() && need_resched())
if (need_resched())
set_dec(1);
return 0;
}