linux-kernel - [PATCH v4 1/2] printk: stop including cache.h from printk.h

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Message-Id: <20220426203231.2107365-1-pcc@google.com>
Date:   Tue, 26 Apr 2022 13:32:30 -0700
From:   Peter Collingbourne <pcc@...gle.com>
To:     Andrey Konovalov <andreyknvl@...il.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     Peter Collingbourne <pcc@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        vbabka@...e.cz, penberg@...nel.org, roman.gushchin@...ux.dev,
        iamjoonsoo.kim@....com, rientjes@...gle.com,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH v4 1/2] printk: stop including cache.h from printk.h

An inclusion of cache.h in printk.h was added in 2014 in
commit c28aa1f0a847 ("printk/cache: mark printk_once test variable
__read_mostly") in order to bring in the definition of __read_mostly. The
usage of __read_mostly was later removed in commit 3ec25826ae33 ("printk:
Tie printk_once / printk_deferred_once into .data.once for reset")
which made the inclusion of cache.h unnecessary, so remove it.

We have a small amount of code that depended on the inclusion of cache.h
from printk.h; fix that code to include the appropriate header.

This fixes a circular inclusion on arm64 (linux/printk.h -> linux/cache.h
-> asm/cache.h -> linux/kasan-enabled.h -> linux/static_key.h ->
linux/jump_label.h -> linux/bug.h -> asm/bug.h -> linux/printk.h) that
would otherwise be introduced by the next patch.

Build tested using {allyesconfig,defconfig} x {arm64,x86_64}.

Link: https://linux-review.googlesource.com/id/I8fd51f72c9ef1f2d6afd3b2cbc875aa4792c1fba
Signed-off-by: Peter Collingbourne <pcc@...gle.com>
---
 arch/arm64/include/asm/mte-kasan.h | 1 +
 arch/arm64/include/asm/percpu.h    | 1 +
 drivers/firmware/smccc/kvm_guest.c | 1 +
 include/linux/printk.h             | 1 -
 4 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/mte-kasan.h b/arch/arm64/include/asm/mte-kasan.h
index a857bcacf0fe..9f79425fc65a 100644
--- a/arch/arm64/include/asm/mte-kasan.h
+++ b/arch/arm64/include/asm/mte-kasan.h
@@ -6,6 +6,7 @@
 #define __ASM_MTE_KASAN_H
 
 #include <asm/compiler.h>
+#include <asm/cputype.h>
 #include <asm/mte-def.h>
 
 #ifndef __ASSEMBLY__
diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h
index 8f1661603b78..b9ba19dbdb69 100644
--- a/arch/arm64/include/asm/percpu.h
+++ b/arch/arm64/include/asm/percpu.h
@@ -10,6 +10,7 @@
 #include <asm/alternative.h>
 #include <asm/cmpxchg.h>
 #include <asm/stack_pointer.h>
+#include <asm/sysreg.h>
 
 static inline void set_my_cpu_offset(unsigned long off)
 {
diff --git a/drivers/firmware/smccc/kvm_guest.c b/drivers/firmware/smccc/kvm_guest.c
index 2d3e866decaa..89a68e7eeaa6 100644
--- a/drivers/firmware/smccc/kvm_guest.c
+++ b/drivers/firmware/smccc/kvm_guest.c
@@ -4,6 +4,7 @@
 
 #include <linux/arm-smccc.h>
 #include <linux/bitmap.h>
+#include <linux/cache.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 1522df223c0f..8e8d74edf121 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -6,7 +6,6 @@
 #include <linux/init.h>
 #include <linux/kern_levels.h>
 #include <linux/linkage.h>
-#include <linux/cache.h>
 #include <linux/ratelimit_types.h>
 #include <linux/once_lite.h>
 
-- 
2.36.0.rc2.479.g8af0fa9b8e-goog