linux-kernel - [PATCH 2/3] powerpc/8xx: Define a MODULE area below kernel text

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Message-Id: <a225606d5b3a8bc53fe612ad52c855c60b0a0a58.1617283827.git.christophe.leroy@csgroup.eu>
Date:   Thu,  1 Apr 2021 13:30:42 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, jniethe5@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 2/3] powerpc/8xx: Define a MODULE area below kernel text

On the 8xx, TASK_SIZE is 0x80000000. The space between TASK_SIZE
and PAGE_OFFSET is not used.

In order to benefit from the powerpc specific module_alloc()
function which allocate modules with 32 Mbytes from
end of kernel text, define MODULES_VADDR and MODULES_END.

Set a 256Mb area just below PAGE_OFFSET, like book3s/32.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/nohash/32/mmu-8xx.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/include/asm/nohash/32/mmu-8xx.h b/arch/powerpc/include/asm/nohash/32/mmu-8xx.h
index 478249959baa..6e4faa0a9b35 100644
--- a/arch/powerpc/include/asm/nohash/32/mmu-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/mmu-8xx.h
@@ -172,6 +172,9 @@
 
 #define mmu_linear_psize	MMU_PAGE_8M
 
+#define MODULES_VADDR	(PAGE_OFFSET - SZ_256M)
+#define MODULES_END	PAGE_OFFSET
+
 #ifndef __ASSEMBLY__
 
 #include <linux/mmdebug.h>
-- 
2.25.0