parisc: Do not use an ordered store in pa_tlb_lock() (e72b23de) · Commits · 戴 / test

No need to use an ordered store in pa_tlb_lock() and update the comment regarng usage of the sid register to unlocak a spinlock in tlb_unlock0(). Signed-off-by:

John David Anglin <dave.anglin@bell.net> Signed-off-by:

Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v5.0+

arch/parisc/kernel/entry.S

+7 −2

Original line number	Diff line number	Diff line
		@@ -455,7 +455,7 @@
		LDREG 0(\ptp),\pte
		bb,<,n \pte,_PAGE_PRESENT_BIT,3f
		b \fault
		stw,ma \spc,0(\tmp)
		stw \spc,0(\tmp)
		99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
		#endif
		2: LDREG 0(\ptp),\pte
		@@ -463,7 +463,12 @@
		3:
		.endm

		/* Release pa_tlb_lock lock without reloading lock address. */
		/* Release pa_tlb_lock lock without reloading lock address.
		Note that the values in the register spc are limited to
		NR_SPACE_IDS (262144). Thus, the stw instruction always
		stores a nonzero value even when register spc is 64 bits.
		We use an ordered store to ensure all prior accesses are
		performed prior to releasing the lock. */
		.macro tlb_unlock0 spc,tmp
		#ifdef CONFIG_SMP
		98: or,COND(=) %r0,\spc,%r0

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