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From: Leif Lindholm <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	will.deacon-5wv7dgnIgG8@public.gmane.org,
	catalin.marinas-5wv7dgnIgG8@public.gmane.org
Cc: ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
Subject: [PATCH 2/2] arm64: call early_ioremap_reset() in paging_init()
Date: Mon,  5 Jan 2015 18:33:55 +0000	[thread overview]
Message-ID: <1420482835-6444-3-git-send-email-leif.lindholm@linaro.org> (raw)
In-Reply-To: <1420482835-6444-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

arm64 does not support early_memremap/memunmap/ioremap/iounmap after
paging_init() has been called. The core early_*remap code handles this
via the after_paging_init variable, which is set by a call to
early_ioremap_reset().

However, arm64 currently does not call early_ioremap_reset(), which
has made it possible to poke around in the fixmap region after kmap
is enabled. Add the required call.

Signed-off-by: Leif Lindholm <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
 arch/arm64/mm/mmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 6032f3e..506544f 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -348,6 +348,7 @@ void __init paging_init(void)
 {
 	void *zero_page;
 
+	early_ioremap_reset();
 	map_mem();
 
 	/*
-- 
2.1.3

WARNING: multiple messages have this Message-ID (diff)
From: leif.lindholm@linaro.org (Leif Lindholm)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] arm64: call early_ioremap_reset() in paging_init()
Date: Mon,  5 Jan 2015 18:33:55 +0000	[thread overview]
Message-ID: <1420482835-6444-3-git-send-email-leif.lindholm@linaro.org> (raw)
In-Reply-To: <1420482835-6444-1-git-send-email-leif.lindholm@linaro.org>

arm64 does not support early_memremap/memunmap/ioremap/iounmap after
paging_init() has been called. The core early_*remap code handles this
via the after_paging_init variable, which is set by a call to
early_ioremap_reset().

However, arm64 currently does not call early_ioremap_reset(), which
has made it possible to poke around in the fixmap region after kmap
is enabled. Add the required call.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 arch/arm64/mm/mmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 6032f3e..506544f 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -348,6 +348,7 @@ void __init paging_init(void)
 {
 	void *zero_page;
 
+	early_ioremap_reset();
 	map_mem();
 
 	/*
-- 
2.1.3

  parent reply	other threads:[~2015-01-05 18:33 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-05 18:33 [PATCH 0/2] arm64: don't call early_*map() post paging_init() Leif Lindholm
2015-01-05 18:33 ` Leif Lindholm
2015-01-05 18:33 ` [PATCH 1/2] arm64: don't make early_*map() calls " Leif Lindholm
2015-01-05 18:33   ` Leif Lindholm
2015-01-06  9:38   ` Ard Biesheuvel
2015-01-06  9:38     ` Ard Biesheuvel
2015-01-06 13:39     ` Leif Lindholm
2015-01-06 13:39       ` Leif Lindholm
     [not found] ` <1420482835-6444-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-01-05 18:33   ` Leif Lindholm [this message]
2015-01-05 18:33     ` [PATCH 2/2] arm64: call early_ioremap_reset() in paging_init() Leif Lindholm
     [not found]     ` <1420482835-6444-3-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-01-06  9:39       ` Ard Biesheuvel
2015-01-06  9:39         ` Ard Biesheuvel

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