linux-kernel - Re: [RFC 3/5] livepatch: Allow to distinguish different version of system state changes

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Date:   Fri, 21 Jun 2019 13:27:58 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Petr Mladek <pmladek@...e.com>
cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Nicolai Stange <nstange@...e.de>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 3/5] livepatch: Allow to distinguish different version of
 system state changes

> +/* Check if the patch is able to deal with the given system state. */
> +static bool klp_is_state_compatible(struct klp_patch *patch,
> +                                 struct klp_state *state)
> +{
> +     struct klp_state *new_state;
> +
> +     new_state = klp_get_state(patch, state->id);
> +
> +     if (new_state)
> +             return new_state->version < state->version ? false : true;

return new_state->version >= state->version;

?

> +     /* Cumulative livepatch must handle all already modified states. 
*/
> +     return patch->replace ? false : true;

return !patch->replace;

?

> + * Check if the new livepatch will not break the existing system states.
> + * Cumulative patches must handle all already modified states.
> + * Non-cumulative patches can touch already modified states.
> + */
> +bool klp_is_patch_compatible(struct klp_patch *patch)

make C=1 kernel/livepatch/state.o

kernel/livepatch/state.c:107:6: warning: symbol 'klp_is_patch_compatible' was not declared. Should it be static?

#include "state.h" in state.c would solve it.

Miroslav