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Peter Anvin" Subject: [PATCH v4 07/12] x86/mtrr: allocate mtrr_value array dynamically Date: Mon, 6 Mar 2023 17:34:20 +0100 Message-Id: <20230306163425.8324-8-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230306163425.8324-1-jgross@suse.com> References: <20230306163425.8324-1-jgross@suse.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759638038656601353?= X-GMAIL-MSGID: =?utf-8?q?1759638038656601353?= The mtrr_value[] array is a static variable, which is used only in a few configurations. Consuming 6kB is ridiculous for this case, especially as the array doesn't need to be that large and it can easily be allocated dynamically. Signed-off-by: Juergen Gross --- arch/x86/kernel/cpu/mtrr/mtrr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtrr.c index 0c83990501f5..50cd2287b6e1 100644 --- a/arch/x86/kernel/cpu/mtrr/mtrr.c +++ b/arch/x86/kernel/cpu/mtrr/mtrr.c @@ -581,7 +581,7 @@ struct mtrr_value { unsigned long lsize; }; -static struct mtrr_value mtrr_value[MTRR_MAX_VAR_RANGES]; +static struct mtrr_value *mtrr_value; static int mtrr_save(void) { @@ -750,6 +750,7 @@ static int __init mtrr_init_finialize(void) * TBD: is there any system with such CPU which supports * suspend/resume? If no, we should remove the code. */ + mtrr_value = kcalloc(num_var_ranges, sizeof(*mtrr_value), GFP_KERNEL); register_syscore_ops(&mtrr_syscore_ops); return 0;