From: Peter Zijlstra <peterz@infradead.org>
To: ralf@linux-mips.org
Cc: linux-kernel@vger.kernel.org, linux-mips@linux-mips.org
Subject: [RFC][PATCH] MIPS: Use pagefault_{dis,en}able for k{,un}map_coherent
Date: Tue, 10 Sep 2013 13:33:22 +0200 [thread overview]
Message-ID: <20130910113322.GE31370@twins.programming.kicks-ass.net> (raw)
Hi Ralf,
I was poking about the preempt_count muck and stumbled upon this..
Should you be using the pagefault_*() methods here?
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -124,7 +124,7 @@ void *kmap_coherent(struct page *page, u
BUG_ON(Page_dcache_dirty(page));
- inc_preempt_count();
+ pagefault_disable();
idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
#ifdef CONFIG_MIPS_MT_SMTC
idx += FIX_N_COLOURS * smp_processor_id() +
@@ -193,8 +193,7 @@ void kunmap_coherent(void)
write_c0_entryhi(old_ctx);
EXIT_CRITICAL(flags);
#endif
- dec_preempt_count();
- preempt_check_resched();
+ pagefault_enable();
}
void copy_user_highpage(struct page *to, struct page *from,
reply other threads:[~2013-09-10 11:33 UTC|newest]
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