From patchwork Thu Oct 10 07:01:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Patchwork-Id: 13829618 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9609A1C7B78; Thu, 10 Oct 2024 07:02:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728543742; cv=none; b=tdrUvoO2K3z61QQYIA0UgJT1jm4KS/d6HdwAcFXGo1l/a/iKq3v90zm5TDr7WOfH8l84OtH1uRlGXaJpPcVOMBLWqFQvsNwX1owYZTih9YsRlPXDogR5PPiaavwD6ehXOGZbIED4PNsg4HVasKA/RttfVG2Dv7h12a/L4/rYndQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728543742; c=relaxed/simple; bh=ignJMWvkz6E09b32wojexZ5aYHvKHJxJ66AG8ULzy/s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AyOEj78WtB6kIyh4U2r2d5fbcAZ8G3ohSVDvrUzcvTXjfZZpNEfNoYS7wZY6HS2pJsCfsNJQMQJZJTfewlSBVSm+bIbzVEr9CKn3n//868MvYCMvIoPCEHbct3MRYure+EQkqc/Ngs/q08mPXhAK+SWvPuvNnUzazohhSegAKc4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=lOtgRqrv; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=YPIBKS6f; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="lOtgRqrv"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="YPIBKS6f" From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1728543734; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=K/qRGvuOAyfRD/y9Hw9vI8MnAlUye5M5TSGqQF5eFfA=; b=lOtgRqrvkWhHs5FDIZhLs96p61mNiVNt6t9AYoLa1thljfyyRleywPXqjeoScsCAYmTDWv 0r24GjB2ulGnJkoTNTjKVsfA+qpBbIlUHVuwLRLvSg88aafASg37t3FvSAYJKTDkrEFMCF Q5L0Cf2OrOk89w2nbzDgMcSfACgIJSovpms7P8XAGOW3atwPhKJxWF47+FzFTW5N/EG7Yg 2HRzhNr/4GYMtRtie63QKRml5xYibGYWTE6BlzE/8/BbDmr8Rpeyjiyozaei/60X/TdWdk tpOmuMYwEhnBlSzBYpZ2bYOmey08TelkMPNRC3g4oVQhOg4Po+4u5KTFktMPbA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1728543734; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=K/qRGvuOAyfRD/y9Hw9vI8MnAlUye5M5TSGqQF5eFfA=; b=YPIBKS6fUErLq7tLoUgds5pLbK4UX7EnE/rx00rRDYWatFVJ7tNFzgNAHim8WYkolJMXyq eaBMgmb4NJ1+7MBA== Date: Thu, 10 Oct 2024 09:01:27 +0200 Subject: [PATCH 25/28] powerpc: Add kconfig option for the systemcfg page Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241010-vdso-generic-base-v1-25-b64f0842d512@linutronix.de> References: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> In-Reply-To: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> To: Guo Ren , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , Russell King , Huacai Chen , WANG Xuerui , Theodore Ts'o , "Jason A. Donenfeld" , Thomas Bogendoerfer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Vincenzo Frascino Cc: Christophe Leroy , linux-csky@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, =?utf-8?q?Thoma?= =?utf-8?q?s_Wei=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1728543717; l=1852; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=ignJMWvkz6E09b32wojexZ5aYHvKHJxJ66AG8ULzy/s=; b=C1rNttCPnaP1zlaUjv7iMx0innkkyXvxyKgVYJIFWgJtuaN0zt8AzArXt/OrnrBtT3yS8PQGE o07lV8IsHQkADjaSA/YIbNTpmAdiIx+Hy0BA1bX+qUHzEj/ePQM5Dd2 X-Developer-Key: i=thomas.weissschuh@linutronix.de; a=ed25519; pk=pfvxvpFUDJV2h2nY0FidLUml22uGLSjByFbM6aqQQws= The systemcfg page through procfs is only a backwards-compatible interface for very old applications. Make it possible to be disabled. This also creates a convenient config #define to guard any accesses to the systemcfg page. Signed-off-by: Thomas Weißschuh --- arch/powerpc/Kconfig | 8 ++++++++ arch/powerpc/kernel/proc_powerpc.c | 4 ++-- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 8094a01974cca1d27002720e706f66bec2a2d035..5d348e1f09d730002eee9894a0b2847e1dac15d5 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -1298,6 +1298,14 @@ config MODULES_SIZE endmenu +config PPC64_PROC_SYSTEMCFG + def_bool y + depends on PPC64 && PROC_FS + help + This option enables the presence of /proc/ppc64/systemcfg through + which the systemcfg page can be accessed. + This interface only exists for backwards-compatibility. + if PPC64 # This value must have zeroes in the bottom 60 bits otherwise lots will break config PAGE_OFFSET diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c index 910d2082e05fd86bd1146815d4b67633a6f2b459..3bda365843e44357538651c6c24c11a41de2eb06 100644 --- a/arch/powerpc/kernel/proc_powerpc.c +++ b/arch/powerpc/kernel/proc_powerpc.c @@ -14,7 +14,7 @@ #include #include -#ifdef CONFIG_PPC64 +#ifdef CONFIG_PPC64_PROC_SYSTEMCFG static loff_t page_map_seek(struct file *file, loff_t off, int whence) { @@ -59,7 +59,7 @@ static int __init proc_ppc64_init(void) } __initcall(proc_ppc64_init); -#endif /* CONFIG_PPC64 */ +#endif /* CONFIG_PPC64_PROC_SYSTEMCFG */ /* * Create the ppc64 and ppc64/rtas directories early. This allows us to