linux-kernel - [PATCH v2 1/5] arm: decompressor: set malloc pool size for the decompressor

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Message-Id: <20200602161731.23033-2-l.stelmach@samsung.com>
Date:   Tue,  2 Jun 2020 18:17:27 +0200
From:   Łukasz Stelmach <l.stelmach@...sung.com>
To:     Russell King <linux@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Enrico Weigelt <info@...ux.net>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        Ben Dooks <ben-linux@...ff.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Łukasz Stelmach <l.stelmach@...sung.com>
Subject: [PATCH v2 1/5] arm: decompressor: set malloc pool size for the
 decompressor

Move the definition of malloc pool size of the decompressor to
a single place. This value will be exposed later for kexec_file loader.

Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
---
 arch/arm/boot/compressed/Makefile | 7 +++++--
 arch/arm/boot/compressed/head.S   | 6 ++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 9c11e7490292..c4195651e371 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -7,7 +7,9 @@
 
 OBJS		=
 
-AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
+MALLOC_SIZE     =0x10000
+
+AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
 HEAD	= head.o
 OBJS	+= misc.o decompress.o
 ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
@@ -68,7 +70,8 @@ ZTEXTADDR	:= 0
 ZBSSADDR	:= ALIGN(8)
 endif
 
-CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
+CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)" \
+			-DMALLOC_SIZE="$(MALLOC_SIZE)"
 
 compress-$(CONFIG_KERNEL_GZIP) = gzip
 compress-$(CONFIG_KERNEL_LZO)  = lzo
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index e8e1c866e413..55758264e776 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -309,7 +309,8 @@ restart:	adr	r0, LC0
 #ifndef CONFIG_ZBOOT_ROM
 		/* malloc space is above the relocated stack (64k max) */
 		add	sp, sp, r0
-		add	r10, sp, #0x10000
+		mov	r10, #MALLOC_SIZE
+		add	r10, r10, sp
 #else
 		/*
 		 * With ZBOOT_ROM the bss/stack is non relocatable,
@@ -623,7 +624,8 @@ not_relocated:	mov	r0, #0
  */
 		mov	r0, r4
 		mov	r1, sp			@ malloc space above stack
-		add	r2, sp, #0x10000	@ 64k max
+		mov	r2, #MALLOC_SIZE	@ 64k max
+		add	r2, r2, sp
 		mov	r3, r7
 		bl	decompress_kernel
 
-- 
2.26.2