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Rao" To: Michael Ellerman Subject: [PATCH] powerpc/security: Provide stubs for when PPC_BARRIER_NOSPEC isn't enabled Date: Mon, 10 Jan 2022 15:37:45 +0530 Message-Id: <20220110100745.711970-1-naveen.n.rao@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ei8r6PHAjekeU_k8VkdSQHczwO1Hp8CQ X-Proofpoint-ORIG-GUID: ei8r6PHAjekeU_k8VkdSQHczwO1Hp8CQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-10_04,2022-01-07_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 suspectscore=0 phishscore=0 impostorscore=0 mlxscore=0 priorityscore=1501 clxscore=1011 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201100071 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, lkp@intel.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" kernel test robot reported the below build error with a randconfig: powerpc64-linux-ld: arch/powerpc/net/bpf_jit_comp64.o:(.toc+0x0): undefined reference to `powerpc_security_features' This can happen if CONFIG_PPC_BARRIER_NOSPEC is not enabled. Address this by providing stub functions for security_ftr_enabled() and related helpers when the config option is not enabled. Reported-by: kernel test robot Signed-off-by: Naveen N. Rao --- arch/powerpc/include/asm/security_features.h | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/security_features.h b/arch/powerpc/include/asm/security_features.h index 27574f218b371f..f2b990052641a0 100644 --- a/arch/powerpc/include/asm/security_features.h +++ b/arch/powerpc/include/asm/security_features.h @@ -8,10 +8,6 @@ #ifndef _ASM_POWERPC_SECURITY_FEATURES_H #define _ASM_POWERPC_SECURITY_FEATURES_H - -extern u64 powerpc_security_features; -extern bool rfi_flush; - /* These are bit flags */ enum stf_barrier_type { STF_BARRIER_NONE = 0x1, @@ -20,6 +16,10 @@ enum stf_barrier_type { STF_BARRIER_SYNC_ORI = 0x8, }; +#ifdef CONFIG_PPC_BARRIER_NOSPEC +extern u64 powerpc_security_features; +extern bool rfi_flush; + void setup_stf_barrier(void); void do_stf_barrier_fixups(enum stf_barrier_type types); void setup_count_cache_flush(void); @@ -45,6 +45,13 @@ enum stf_barrier_type stf_barrier_type_get(void); static inline enum stf_barrier_type stf_barrier_type_get(void) { return STF_BARRIER_NONE; } #endif +#else /* CONFIG_PPC_BARRIER_NOSPEC */ +static inline void security_ftr_set(u64 feature) { } +static inline void security_ftr_clear(u64 feature) { } +static inline bool security_ftr_enabled(u64 feature) { return false; } +static inline enum stf_barrier_type stf_barrier_type_get(void) { return STF_BARRIER_NONE; } +#endif /* CONFIG_PPC_BARRIER_NOSPEC */ + // Features indicating support for Spectre/Meltdown mitigations // The L1-D cache can be flushed with ori r30,r30,0 base-commit: bdcf18e133f656b2c97390a594fc95e37849e682 -- 2.34.1