linux-kernel - [PATCH v4 4/6] arm64: remove __asm_flush_icache

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Date:   Wed,  4 Dec 2019 18:20:56 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     pasha.tatashin@...een.com, jmorris@...ei.org, sashal@...nel.org,
        linux-kernel@...r.kernel.org, catalin.marinas@....com,
        will@...nel.org, steve.capper@....com,
        linux-arm-kernel@...ts.infradead.org, maz@...nel.org,
        james.morse@....com, vladimir.murzin@....com, mark.rutland@....com,
        tglx@...utronix.de, gregkh@...uxfoundation.org,
        allison@...utok.net, info@...ux.net, alexios.zavras@...el.com,
        sstabellini@...nel.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, stefan@...er.ch, yamada.masahiro@...ionext.com,
        xen-devel@...ts.xenproject.org, linux@...linux.org.uk,
        andrew.cooper3@...rix.com, julien@....org
Subject: [PATCH v4 4/6] arm64: remove __asm_flush_icache_range

__asm_flush_icache_range is an alias to __asm_flush_cache_user_range,
but now that these functions are called from C wrappers the fall
through can instead be done at a higher level.

Remove the __asm_flush_icache_range alias in assembly, and instead call
__flush_cache_user_range() from __flush_icache_range().

Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
---
 arch/arm64/include/asm/cacheflush.h |  5 +----
 arch/arm64/mm/cache.S               | 14 --------------
 arch/arm64/mm/flush.c               |  2 +-
 3 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 431f8da2dd02..ea563344b4ad 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -61,7 +61,6 @@
  *		- kaddr  - page address
  *		- size   - region size
  */
-extern void __asm_flush_icache_range(unsigned long start, unsigned long end);
 extern long __asm_flush_cache_user_range(unsigned long start,
 					 unsigned long end);
 extern int  __asm_invalidate_icache_range(unsigned long start,
@@ -83,9 +82,7 @@ static inline void __flush_cache_user_range(unsigned long start,
 
 static inline void __flush_icache_range(unsigned long start, unsigned long end)
 {
-	uaccess_ttbr0_enable();
-	__asm_flush_icache_range(start, end);
-	uaccess_ttbr0_disable();
+	__flush_cache_user_range(start, end);
 }
 
 static inline int invalidate_icache_range(unsigned long start,
diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
index 602b9aa8603a..1981cbaf5d92 100644
--- a/arch/arm64/mm/cache.S
+++ b/arch/arm64/mm/cache.S
@@ -14,19 +14,6 @@
 #include <asm/alternative.h>
 #include <asm/asm-uaccess.h>
 
-/*
- *	__asm_flush_icache_range(start,end)
- *
- *	Ensure that the I and D caches are coherent within specified region.
- *	This is typically used when code has been written to a memory region,
- *	and will be executed.
- *
- *	- start   - virtual start address of region
- *	- end     - virtual end address of region
- */
-ENTRY(__asm_flush_icache_range)
-	/* FALLTHROUGH */
-
 /*
  *	__asm_flush_cache_user_range(start,end)
  *
@@ -62,7 +49,6 @@ alternative_else_nop_endif
 1:	ret
 9:	mov	x0, #-EFAULT
 	b	1b
-ENDPROC(__asm_flush_icache_range)
 ENDPROC(__asm_flush_cache_user_range)
 
 /*
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index b23f34d23f31..61521285f27d 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -75,7 +75,7 @@ EXPORT_SYMBOL(flush_dcache_page);
 /*
  * Additional functions defined in assembly.
  */
-EXPORT_SYMBOL(__asm_flush_icache_range);
+EXPORT_SYMBOL(__asm_flush_cache_user_range);
 
 #ifdef CONFIG_ARCH_HAS_PMEM_API
 void arch_wb_cache_pmem(void *addr, size_t size)
-- 
2.24.0