linux-kernel - RE: [PATCH V2 05/15] x86/vdso: Move out the CPU number store

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Date:   Thu, 31 May 2018 21:06:57 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
CC:     "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Metzger, Markus T" <markus.t.metzger@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V2 05/15] x86/vdso: Move out the CPU number store

>> +/* Bit size and mask of CPU number stored in the per CPU data */
>> +#define PERCPU_CPU_SIZE                        12
>> +#define PERCPU_CPU_MASK                        0xfff

> This name is confusing.  Maybe LSL_TSCP_CPU_MASK?

> Can you also add a helpers like:

> static inline unsigned long make_lsl_tscp(unsigned int cpu, unsigned
> int node) { ... }
> static inline unsigned int lsl_tscp_to_cpu(unsigned long x) { ... }
> static inline unsigned int lsl_tscp_to_node(unsigned long x) { ... }

> and use them everywhere?  This will make it lot easier to understand the code.

Will rename and include the helpers as suggested.

> +#ifdef CONFIG_X86_32
> +                       GDT_ENTRY_PERCPU,
> +#else /* 64 bit */
> +                       GDT_ENTRY_PER_CPU,
>  #endif

> Please just rename one of these to match the other one.

Okay, I will try.